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A Al-Strontium Alloy Modifier Suitable for Casting Al-Si Alloy
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A technology of casting aluminum-silicon alloy and aluminum-strontium alloy, which is applied in the field of alloy metal materials, can solve the problems of high selling price, increased cost of infiltration, and complicated equipment, so as to improve yield, reduce high-temperature oxidation loss, The effect of reducing production costs
Active Publication Date: 2017-04-05
WUHU YONGYU AUTOCAR INDAL
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Problems solved by technology
Due to the high melting point of aluminum-strontium alloy, the temperature for producing aluminum-strontium alloy by infiltration method is as high as 900°C, and the burning loss of strontium is serious, and the loss ratio is as high as 20% to 35%.
In this way, the cost of infiltration method increases a lot due to the burning loss of strontium
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Embodiment 1
[0048] The chemical composition of the aluminum-strontium alloy modifier in this embodiment is calculated by weight percentage: 10% strontium, 6% silicon, and the rest is aluminum, and the modified agent is AlSr10.
[0049] The preparation process of the aluminum-strontium alloy modifier of the present embodiment comprises the following steps:
[0050] (1) Ingredients process;
[0051] According to the percentage by weight: 10% strontium, 6% silicon, and the balance being aluminum, weigh aluminum-silicon alloypowder and strontium powder;
[0052] (2) Melting process;
[0053] Melting the aluminum-silicon alloy, the melting temperature is preferably 750°C, and slagging and removing the slag after melting to obtain a clean aluminum-silicon melt;
[0054] (3) Al-Si melt purification process;
[0055] Add a sodium-free slagcleaning agent accounting for 1.5‰ of the total weight to the aluminum-silicon melt, and remove the slag in the aluminum-silicon melt after fully stirring, s...
Embodiment 2
[0071] The chemical composition of the aluminum-strontium alloy modifier in this embodiment is calculated by weight percentage: 9.5% strontium, 6.5% silicon, and the rest is aluminum.
[0072] The preparation process of the aluminum-strontium alloy modifier of the present embodiment comprises the following steps:
[0073] (1) Ingredients process;
[0074] According to the percentage by weight: 9.5% strontium, 6.5% silicon, and the balance being aluminum, weigh aluminum-silicon alloy powder and strontium powder;
[0075] (2) Melting process;
[0076] Melting the aluminum-silicon alloy, the melting temperature is preferably 750°C, and slagging and removing the slag after melting to obtain a clean aluminum-silicon melt;
[0077] (3) Al-Si melt purification process;
[0078] Add a sodium-free slag cleaning agent accounting for 1.5‰ of the total weight to the aluminum-silicon melt, and remove the slag in the aluminum-silicon melt after fully stirring, so as to achieve the purpos...
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Abstract
The invention discloses an aluminum-strontiumalloy modifier suitable for casting aluminum-siliconalloy. The aluminum-strontiumalloy modifier comprises the following chemical components in percentage by weight: 4%-6% of strontium, 5%-7% of silicon and the balance of aluminum. According to the aluminum-strontium alloy modifier, due to the addition of silicon, the melting temperature of the alloy can be reduced; the melting temperature of aluminum-strontium alloy can be reduced by about 100 DEG C; the melting temperature during production can be reduced to 750-800 DEG C, and is greatly reduced in comparison with the melting temperature of 830-900 DEG C when aluminum-strontium binary alloy is produced; due to the reduction of the melting temperature, high-temperature oxidation loss of strontium can be reduced; the yield of the strontium is improved; the production cost of the modifier is reduced; and the deterioration property of the aluminum-strontium alloy is not affected.
Description
technical field [0001] The invention belongs to the technical field of alloy metal materials. Specifically, the invention relates to an aluminum-strontium alloy modifier suitable for casting aluminum-silicon alloys. Background technique [0002] Cast aluminum-silicon alloy has the advantages of low density, high strength, wear resistance, good heat resistance, and low thermal expansion coefficient, so it is a type of alloy with the widest application range and the largest output among cast aluminum alloys. However, with the increase of silicon content in aluminum-silicon alloys, a large amount of acicular eutectic silicon appears in the structure, and even coarse multi-angle block primary silicon appears, which severely splits the matrix and significantly reduces the mechanical properties of the alloy, especially the plastic properties. Machinability deteriorates. Therefore, the cast aluminum-silicon alloy usually adopts modification treatment to change the shape and size o...
Claims
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